Statistics Class 9 Notes Maths - Chapter 14

Chapter: 14

What Are Statistics ?

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    Statistics is a branch of study that deals with the collection, presentation, analysis and interpretation of data.

    Data

    Facts or figures, collected with a definite purpose.

    Graphical Representation Of Data

    Bar Graphs, Histograms of uniform & varying widths and frequency polygons.

    Raw Data

    The data obtained in original form.

    Grouped Data

    The data given in the form of class interval such as 0–20, 20 – 40, and so on.

    Class Size

    Upper limit - Lower limit

    Frequency

    The number of times an observation or group observations occur.

    Exclusive Form

    Upper limit of the one class is lower limit of the next class.

    Inclusive Form

    Upper limit of the class is not same as lower limit of the next class.

    Class Mark

    (Lower limit+Upper limit/2)